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  1. #1
    Sr. Apprentice
    Join Date
    Dec 2008
    Kamloops, BC

    Question Rear air and heat not working?

    Hey guys,

    Just wondering if any of you had some ideas for me. I have an '03 Yukon SLT that has rear air/heat (which can also be controlled individually in the rear if desired). However, the air blew hot during the summer and now it blows cold during the winter! The front works fine.

    Any ideas or tips I could try to check out? Thanks, guys!
    2003 GMC Yukon SLT
    5.3L Flexfuel V8

  2. #2


    have you checked for any vaccume leakes?

    it kinda sounds like sometihng is crossed

    2002 Jeep Wrangler Sport 4x4 (the Yellow Jacket)
    4inch suspension 3inch body
    Straight 6 (383 Stroker within a year)
    36inch SuperSwamper TSL.
    Detroit Loccers
    Daily Driver Weekend Wheeler
    much more...

    2004 Sierra crew cab, 2wd, 5.3 V8
    2inch Daystar Leveling kit
    single dumped Flowmaster 40 sieries exaust(removed)
    Mb Blitz Chrome wheels
    Leer Bed Cover(for sale)
    50k miles

  3. #3
    Sr. Apprentice
    Join Date
    Dec 2008
    Kamloops, BC


    Ok, my Father-in-Law and I took a close hard look and found out a lot of stuff that is NOT broken, but not yet what IS broken and causing this issue. We removed the side panels around the rear heater and found no vacuum leaks/issues. What we did find was that the two motors that control the temperature and also the air direction (head/feet/both) seem to not be working. When the controls are activated, these motors don't budge. We tested and found power going to each motor, so I'm going to try replacing one and seeing if it solves the issue.

    I'm slightly doubtful, as it would be quite a coincidence to have both motors simulaneously fail, or would I be wrong in this thinking?

    Anyways, just a bit of an update for you. Luckily these GM heaters put out a good bit of heat, so the front one is ample for now. But come summer, the kids will for sure be crying for the A/C!!!
    2003 GMC Yukon SLT
    5.3L Flexfuel V8

  4. #4

    Default Re: Rear air and heat not working

    I'm also having the same problem with the heat not working in my '03 Tahoe. I looked around the internet and found a site that I think may solve the problem. Check out this site and see if it works for you.

    The link isn't copying right, but past it into your browser and remove the spaces between "full size chevy" and it should work.
    Last edited by NRTolly; 12-24-2009 at 10:16 AM.

  5. #5


    I had that issue with my 96 Burban , just got it fixed.

    Don't know if its the same problem , but on mine it was the rear expansion valve !!!

    1996 Suburban K3500 SLT DUALLY
    1988 Camaro RS 383 stroker LT1
    1992 32' Aero-tek Race Boat, 600 CI BBC

  6. #6

    Default 2003 Yukon XL Suburban GM GMC Rear heater Not blowing / working

    I got a 2003 GMC yukon Xl, same as the Chevy Suburban. Rear Blower not working. I replace the blower motor and resister before checking power. Still nothing.

    I then checked for power: No power to blower, but I have 12V at the orange 3 prog plug going in to the resister,just next to the blower, new standard p/n RU394 - old p/N Carter 7491. The blower motor power comes from resister - 12V into resistor but no V out to rear blower motor.

    Where else should I look any one else have this problem?

    Getting cold in NY and I need the rear blower, back seat 3rd row is far away from the front blower LOL.

    Last edited by tmjhazer; 10-17-2010 at 04:35 PM.

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